/**
 * @Author wtzhhh
 * @create 2021/3/31 上午 11:00
 */
public class Sum {
    public int sum(int n, int m) {
        // 前置断言
        assert n >= 1 && n <= 99;
        assert m >= 1 && m <= 99;
        assert m + n <= 99;

        return n + m;
    }
}
